EP0091581A3 - Crossed beam high frequency anti-theft system - Google Patents

Crossed beam high frequency anti-theft system Download PDF

Info

Publication number
EP0091581A3
EP0091581A3 EP83102895A EP83102895A EP0091581A3 EP 0091581 A3 EP0091581 A3 EP 0091581A3 EP 83102895 A EP83102895 A EP 83102895A EP 83102895 A EP83102895 A EP 83102895A EP 0091581 A3 EP0091581 A3 EP 0091581A3
Authority
EP
European Patent Office
Prior art keywords
frequency
center frequency
antenna
displaced
antennae
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83102895A
Other versions
EP0091581B1 (en
EP0091581A2 (en
Inventor
Philip Daniel Fancher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zeneca Inc
Original Assignee
ICI Americas Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ICI Americas Inc filed Critical ICI Americas Inc
Priority to AT83102895T priority Critical patent/ATE34474T1/en
Publication of EP0091581A2 publication Critical patent/EP0091581A2/en
Publication of EP0091581A3 publication Critical patent/EP0091581A3/en
Application granted granted Critical
Publication of EP0091581B1 publication Critical patent/EP0091581B1/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2422—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using acoustic or microwave tags
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V15/00—Tags attached to, or associated with, an object, in order to enable detection of the object
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2471—Antenna signal processing by receiver or emitter

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Acoustics & Sound (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Burglar Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Aerials With Secondary Devices (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Circuits Of Receivers In General (AREA)
  • Alarm Systems (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Pyrane Compounds (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Abstract

An article surveillance system employs a label or tag containing a non-linear impedance element, such as a semi-conductor diode, connected to a metal antenna loop configured to pick up two distinct radio frequency transmissions displaced on either side of a selected center frequency. The non-linear impedance element connects opposing sides of a closed loop section at one end of the antenna to form a tuned tank circuit having a resonant frequency twice that of the selected center frequency. A first transmitter generates a tone modulated radio frequency displaced on one side of the center frequency, and a second transmitter generates a continuous wave radio frequency displaced from the center frequency on the other side. Both transmitter signals are fed separately to respective radiating antennae located adjacent to a surveillance area. The antennae are chosen to produce circularly polarized transmission of both frequencies within the surveillance area. The two different frequencies picked up by the transponder antenna are mixed by the non-linear impedance causing the tank circuit to resonate at a single higher frequency equal to their sum, which is double the center frequency; that resonant frequency is reradiated to be picked up by a receiver antenna or antennae suitably placed with respect to the surveillance zone to be detected by a very narrow band receiver responsive to the sum frequency. The modulating tone signal is derived from the received signal to produce a gradually increasing charge that is compared against a preselected threshold level to trigger an alarm for a fixed interval only when the detected signal is of a sufficient strength and duration.
EP83102895A 1982-04-12 1983-03-23 Crossed beam high frequency anti-theft system Expired EP0091581B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83102895T ATE34474T1 (en) 1982-04-12 1983-03-23 ANTI-THEFT SYSTEM WITH CROSSING HIGH FREQUENCY BEAM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US36771582A 1982-04-12 1982-04-12
US367715 1982-04-12

Publications (3)

Publication Number Publication Date
EP0091581A2 EP0091581A2 (en) 1983-10-19
EP0091581A3 true EP0091581A3 (en) 1986-01-15
EP0091581B1 EP0091581B1 (en) 1988-05-18

Family

ID=23448316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83102895A Expired EP0091581B1 (en) 1982-04-12 1983-03-23 Crossed beam high frequency anti-theft system

Country Status (15)

Country Link
EP (1) EP0091581B1 (en)
JP (1) JPS5932093A (en)
KR (1) KR910000108B1 (en)
AT (1) ATE34474T1 (en)
AU (1) AU558397B2 (en)
BR (1) BR8301775A (en)
CA (1) CA1233539A (en)
DE (1) DE3376703D1 (en)
DK (1) DK153183A (en)
ES (1) ES521268A0 (en)
FI (1) FI79625C (en)
MC (1) MC1521A1 (en)
NO (1) NO158390C (en)
NZ (1) NZ203790A (en)
ZA (1) ZA832313B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4704602A (en) * 1984-02-15 1987-11-03 Intermodulation And Safety System Ab Method and system for detecting an indicating device
US5106175A (en) * 1989-12-28 1992-04-21 At&T Bell Laboratories Locatable object suitable for underground use and methods of locating same
JPH07167427A (en) * 1993-12-15 1995-07-04 World Seiki:Kk Gas burner and gas oven as well as combustion control method for gas burner
US6046682A (en) * 1997-09-29 2000-04-04 Ncr Corporation Electronic price label including noisemaker and method of locating electronic price labels
US7492259B2 (en) 2005-03-29 2009-02-17 Accu-Sort Systems, Inc. RFID conveyor system and method
US8854212B2 (en) 2009-03-30 2014-10-07 Datalogic Automation, Inc. Radio frequency identification tag identification system
ES2534702B1 (en) * 2013-09-24 2016-02-09 Ontech Security, Sl ELECTROSTATIC FIELD SENSOR AND SECURITY SYSTEM IN INTERIOR SPACES
CN106980144A (en) * 2017-03-22 2017-07-25 绍兴职业技术学院 A kind of hard label mass parameter detects circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2551348A1 (en) * 1975-11-15 1977-05-18 Wilhelm Jank Antishoplifting resonant tag equipment - has perpendicular exciting and detecting coils to prevent interference from extraneous signals
EP0020062A1 (en) * 1979-05-18 1980-12-10 Parmeko Limited Method and surveillance system for detecting the presence of an e.m. wave receptor reradiator
GB1604220A (en) * 1978-04-24 1981-12-02 Parmeko Ltd Detection systems
WO1982001437A1 (en) * 1980-10-09 1982-04-29 Deterrent Tech Corp Dual frequency anti-theft system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO126975B (en) * 1967-03-30 1973-04-16 John Welsh

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2551348A1 (en) * 1975-11-15 1977-05-18 Wilhelm Jank Antishoplifting resonant tag equipment - has perpendicular exciting and detecting coils to prevent interference from extraneous signals
GB1604220A (en) * 1978-04-24 1981-12-02 Parmeko Ltd Detection systems
EP0020062A1 (en) * 1979-05-18 1980-12-10 Parmeko Limited Method and surveillance system for detecting the presence of an e.m. wave receptor reradiator
WO1982001437A1 (en) * 1980-10-09 1982-04-29 Deterrent Tech Corp Dual frequency anti-theft system

Also Published As

Publication number Publication date
FI831167A0 (en) 1983-04-06
ES8404061A1 (en) 1984-04-01
KR840004597A (en) 1984-10-22
DK153183A (en) 1983-10-13
ES521268A0 (en) 1984-04-01
AU1324283A (en) 1983-10-20
EP0091581B1 (en) 1988-05-18
FI79625B (en) 1989-09-29
ZA832313B (en) 1983-12-28
NO831275L (en) 1983-10-13
JPS5932093A (en) 1984-02-21
KR910000108B1 (en) 1991-01-21
MC1521A1 (en) 1984-02-10
FI79625C (en) 1990-01-10
NO158390C (en) 1988-08-31
NO158390B (en) 1988-05-24
NZ203790A (en) 1986-06-11
CA1233539A (en) 1988-03-01
ATE34474T1 (en) 1988-06-15
EP0091581A2 (en) 1983-10-19
BR8301775A (en) 1983-12-20
JPS6356588B2 (en) 1988-11-08
AU558397B2 (en) 1987-01-29
DE3376703D1 (en) 1988-06-23
FI831167L (en) 1983-10-13
DK153183D0 (en) 1983-04-06

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